820-2936 PP3V42 being pulled down.

[bridges_4u]

Hi mon2,

Sure. I will post those voltages within the next few hours.

Regards

[bridges_4u]

mon2

The SMC_BC_ACOK was at 3.125V. Reballed the SMC. The SDA & SCL voltages are at 3.3V. The SMC_BC_ACOK is 3.251V. PPBUS is at 12.45V.

ISL?????

Regards

[bridges_4u]

Hi mon2

C7523, C7513 & C7554 appears to a verge of rupture. Will that affect the situation that we have here? I don't think so.

Just wanted to know your expert opinion.

Regards

[mon2]

Any component in bad shape is a suspect. Remove all power. Measure the resistance to ground of these parts that are of concern. These 3 caps are linked to the CPU core. Hope that a high side mosfet is not leaky which will result in a damaged CPU. If possible, replace these caps from a donor board.

[bridges_4u]

Hi mon2,

I do not have any donor boards laying around. I shall order those caps tomorrow. What do you think about the voltages posted above the post talking about the caps?

Regards

[bridges_4u]

mon2

The SMC_BC_ACOK was at 3.125V. Reballed the SMC. The SDA & SCL voltages are at 3.3V. The SMC_BC_ACOK is 3.251V. PPBUS is at 12.45V.

ISL?????

Regards

mon2 What do u think about this?

[mon2]

SMC_BC_ACOK should be 3v42 (PP3V42_G3H) to match the pull-up voltage used @ R5087. Remove all power. Meter in resistance mode. Measure the resistance of R5087. Is it ~470k ohms ?

Next confirm that the pull-up voltage is ~3v42 (PP3V42_G3H) to ground on R5087. This same voltage is created @ L6995, pin # 2. Confirm this voltage to ground.

Update - Also share the voltage to ground of PM_BATLOW_L. If this signal is LOW (0v) then the power adapter is not suitable. Test with another; use the original.

[bridges_4u]

Hi mon2,


SMC_BC_ACOK is 3.125V. The resistance of R5087 is 470K Ohms. PP3V42 is 3.420V. I will share the voltage of PM_BATLOW_L shortly.

Regards

[bridges_4u]

Hi mon2,

Will it be good idea if we jump PP3v42 to the SM_BC_ACOK line coming from the ISL6259?

Regards

[mon2]

No, do not jump anything. The voltage on this power good line is considered to be OK but in this state, this line is supposed to be floating or high impedance (hi-z). Then the pull-up resistor @ R5087 is used to define the parked logic state and really should be 3v42.

What is the resistance to ground of SMC_BC_ACOK ? No power during these resistance checks.

[bridges_4u]

Hi mon2,

The resistance of SM_BC_ACOK is 100.1 K Ohms.

[bridges_4u]

Hi mon2,



Diode readings for R5280 & R5281 are 0.243 & 0.244V respectively.

[mon2]

These are good measurements. What is the voltage to ground of PM_BATLOW_L?

[bridges_4u]

These are good measurements. What is the voltage to ground of PM_BATLOW_L?

mon2 The voltage is 3.245V.

[mon2]

What is the exact resistance of R7000? Measure across this part with no power.

[bridges_4u]

Hi mon2,

The resistance of R7000 is 1.2Ohms whilst on the board, connected.

Regards

[mon2]

Short your meter probes. What is the resistance measurement?

[bridges_4u]

Hi mon2,

In resistance mode, the probes read 1.0 Ohms. Are my probes bad? I am using a Fluke 101.

[mon2]

Probes are ok. What is the voltage to ground of PM_SLP_S4_L ?

[bridges_4u]

Probes are ok. What is the voltage to ground of PM_SLP_S4_L ?

mon2

The voltage is 3.258V